![]() | This ![]() It is of interest to the following WikiProjects: | ||||||||||
|
A picture of a sea spider would really go a long way to making the text of this article much clearer, but the only picture of a sea spider I've ever seen (which made this clear to me) is a drawing in Fingerman's Animal Diversity textbook, and the drawing is copyright-encumbered. If you've got access to an image of a sea spider that isn't so encumbered, please put it up here. -- arkuat (talk) 06:28, 16 August 2005 (UTC)
Take a look at a free summary from Science [1]:
Nature articles at [2] and [3]; editorial summary at [4]. kwami 07:57, 20 October 2005 (UTC)
I read somewhere that the sea spiders don't have any coelom. Is this correct?
Click here to see pictures of sea spiders
I think what was meant was a drawing, showing more details of the head and nervous system. Personally I would very much like if some pictures also showed a species with more then 4 pair of legs, since there are species there with 5 of 6 pairs, and a discussion whether 4 pairs is a reduction of the original plan or 5 and 6 is a novelty that arose later. -- Codiv ( talk) 11:33, 9 July 2022 (UTC)
The article contradicts itself: "Sea spiders do not swim but rather walk along the bottom with their stilt-like legs." Then in the next paragraph: "They crawl slowly along (although some do swim), feeding." I'm no expert, but both cannot be true. RandyKaelber 20:51, 22 September 2006 (UTC)
Fixed it. They apparently do both. Gerardw ( talk) 22:23, 19 February 2008 (UTC)
According to Deep Sea News [1]: Also interesting, and also noticed by Kevin, is an error occurs in the video. The announcer discusses giant sea spiders, while what is shown is a swimming crinoid. Accordingly, I'm going to take the link to video down. Gerardw ( talk) 04:22, 20 February 2008 (UTC)
There's interesting information here: http://www.springerlink.com/content/w217212537272172/fulltext.html on sea spider classification. Perhaps it can be used to update the article. Jalwikip ( talk) 10:40, 12 June 2009 (UTC)
This link doesn't work anymore, perhaps somebody can add a working link? Also it would be nice to have some more info on the within/without the Chelicerata debate. Looking at their rather different bodyplan, the head looking more like euanthropods, they probably form a separate lineage, one can easily imagine them descending from lobopodians like Paucipodia. It would be great of somebody with specialized knowledge could elaborate on the fossil evidence-- Codiv ( talk) 11:33, 9 July 2022 (UTC)
There are multiple references to details of pycnogonid anatomy explained by their supposed small size; e.g.:
“ | Because of their small size and slender body and legs, no respiratory system is necessary, with gases moving by diffusion. | ” |
“ | Pycnogonids are so small that each of their tiny muscles consists of only one single cell, surrounded by connective tissue. | ” |
However the lead says:
“ | There are over 1300 known species, ranging in size from 1 to 10 millimetres (0.039 to 0.39 in) to over 90 cm (35 in) in some deep water species. Most are toward the smaller end of this range in relatively shallow depths, however, they can grow to be quite large in Antarctic waters. | ” |
(emphasis mine).
So there are large pycnogonids. I suspect that some of the explanation in the article can be only partially correct (i.e. good for smaller ones but not for large ones). Anyone knows how to solve this discrepancy? Good reviews on pycnogonid anatomy? -- Cyclopia talk 13:30, 17 August 2010 (UTC)
The comment(s) below were originally left at Talk:Sea spider/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.
This article could do with some more references, and internal links in the yet linkless section Reproduction and development. Iron C hris | (talk) 05:41, 14 November 2006 (UTC) |
Last edited at 17:51, 4 January 2007 (UTC). Substituted at 05:39, 30 April 2016 (UTC)
The caption for the figure at the top of the Description section (copied here, right) belongs to a different illustration: clearly the list of marked items in the caption doesn't match the marks on the illustration.
A great admirer of Sherlock Holmes, I deduce that there was a prior illustration for which the caption was written. Some hasty edit (possibly done because of copyright issues) failed to transfer the new caption along with a new illustration. The edit needs to be repaired.
As far as the remedy for the problem goes, my grandmother often said If enough is good, then too much must be better. I think that she would agree that two illustrations have to be better than one, and that both illustrations should be re-joined with their correct captions, and restored to the article – perhaps placed in widely separated locations, where the reader might wish to refer to vocabulary for strange body parts.
67.76.146.84 ( talk) 06:46, 13 May 2017 (UTC)
OK, this may be obscure, but the link to diverticula leads to article about various medical pathologies. Diverticulum (mollusc), although specifically about about mollusc (mollusk) digestion, is more relevant as the same mechanism is in play here. Thus, I'm changing the link to Diverticulum (mollusc) with an eye to expanding the mollusc article to acknowledge that similar mechanisms are found elsewhere in the animal kingdom RATHER THAN to try to rewrite the medically oriented one to include sea-spider anatomy.
GeeBee60 ( talk) 13:56, 17 March 2018 (UTC)
This is fascinating, if it is true. Could really do with a reference — Preceding unsigned comment added by 150.143.245.181 ( talk) 18:53, 31 October 2018 (UTC)
Page has been deleted. 110.225.118.104 ( talk) 18:26, 18 November 2021 (UTC)
The daddy has the baby 173.81.25.240 ( talk) 02:37, 13 June 2022 (UTC)
Pycnogonids are a particularly strange, obscure group of animals that can often be easily mistaken for spiders due to their resemblances. But, are they crustaceans?
Pycnogonids, or sea spiders, are a unique group of animals that live in every ocean around the world and belong to the Pycnogonida class of animals. They are generally between 0.2 inches and 1.2 inches in length and have long, thin legs with no claws or other complex body parts. They also have a single pair of eyes and a small proboscis projecting from the head.
Their relationship to crustaceans has long been a subject of debate. While their body structure is not dissimilar to that of crabs, lobsters, and other crustaceans, their appearance and behavior are much more spider-like. For example, they don’t have any claws or other visible defense mechanisms like crustaceans do.
Based on the recent molecular analysis of sea spiders, it appears that pycnogonids are not related to crustaceans, but instead belong to a separate branch of the arthropod family tree. In fact, some experts now believe that these peculiar ocean-dwellers have been around for more than 450 million years, making them one of the oldest surviving animal phyla on the planet.
Despite their lack of a true classification, pycnogonids remain an enigmatic group of animals. They may not be crustaceans, but they exhibit behavior and structure that is unique among all other species in the animal kingdom. So, while they may not be related to crustaceans, their strange biology and history still make them one of the most interesting creatures on the planet, they are different to spiders, but they are in the same family as crustaceans and spiders. .Underline 2A02:C7C:DB71:7900:C5DF:FBA1:2788:5F02 ( talk) 11:05, 17 September 2023 (UTC)
Are they venomous? 2600:8807:584D:3F00:21B4:66DE:2B78:A265 ( talk) 14:06, 7 November 2023 (UTC)